US 11,991,836 B2
Electrical devices with electrodes on softening polymers and methods of manufacturing thereof
Romil Modi, Austin, TX (US); Jonathan Reeder, Austin, TX (US); Gregory T. Ellson, Dallas, TX (US); Walter E. Voit, Austin, TX (US); and Alexandra Joshi Imre, Austin, TX (US)
Assigned to Board of Regents, The University of Texas System, Austin, TX (US)
Filed by Board of Regents, The University of Texas System, Austin, TX (US)
Filed on Jan. 26, 2023, as Appl. No. 18/102,060.
Application 18/102,060 is a division of application No. 16/591,002, filed on Oct. 2, 2019, granted, now 11,596,072.
Application 16/591,002 is a division of application No. 15/794,863, filed on Oct. 26, 2017, granted, now 10,485,109.
Claims priority of provisional application 62/414,532, filed on Oct. 28, 2016.
Prior Publication US 2023/0180396 A1, Jun. 8, 2023
Int. Cl. H05K 1/09 (2006.01); H05K 1/11 (2006.01); H05K 3/00 (2006.01); H05K 3/04 (2006.01); H05K 3/06 (2006.01); H05K 3/12 (2006.01); H05K 3/40 (2006.01); H01L 21/033 (2006.01); H05K 1/03 (2006.01); H05K 3/34 (2006.01)
CPC H05K 3/4007 (2013.01) [H05K 1/09 (2013.01); H05K 1/111 (2013.01); H05K 3/0041 (2013.01); H05K 3/048 (2013.01); H05K 3/064 (2013.01); H05K 3/067 (2013.01); H05K 3/1216 (2013.01); H05K 3/1225 (2013.01); H01L 21/0331 (2013.01); H05K 1/0393 (2013.01); H05K 3/1283 (2013.01); H05K 3/3463 (2013.01); H05K 2203/043 (2013.01); H05K 2203/087 (2013.01); H05K 2203/166 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electrical device, comprising:
a softening polymer layer;
an electrode layer on a surface of the softening polymer layer; and
a cover polymer layer on the surface of the softening polymer layer, wherein:
an opening in the polymer cover layer is filled with a reflowed solder,
one end of the reflowed solder, located inside the opening, contacts a contact pad site portion of the electrode layer,
another end of the reflowed solder contacts an electrical connector electrode of the device; and
the cover polymer layer is composed of a second softening polymer on the surface of the softening polymer layer, wherein an opening in the second softening polymer cover layer exposes a portion of a surface of the electrode layer, and wherein the softening polymer layer and the cover layer of the second softening polymer are composed of a softening polymer having a Young's modulus that decreases by more than 1 order of magnitude within a 30° C. temperature increase.